Call loop.shutdown_asyncgens before closing the event loop

[provinzkraut]

#222 was closed, mentioning the issues being resolved in the yet-to-be-done #235, running with -W error in Python 3.13, currently fails when there are unclosed async generators.

This is a minimally invasive fix, without attempting to behave like asyncio.run on shutdown in all other scenarios.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.13%. Comparing base (623ab74) to head (761f742).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1034      +/-   ##
==========================================
+ Coverage   91.10%   91.13%   +0.03%     
==========================================
  Files           2        2              
  Lines         562      564       +2     
  Branches       74       74              
==========================================
+ Hits          512      514       +2     
  Misses         30       30              
  Partials       20       20              

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[seifertm]

Solid patch, thank you!

Can you please add an entry to docs/reference/changelog.rst as well, where you briefly explain the change and link to this PR? We can create another patch release for this. Just set the date to UNRELEASED and we'll handle the rest.